core: calculate fontRatio and apply it in GCText
On some low-dpi Android devices with high res (e.g. Galaxy Tab 4) the fonts in Text-like elements appear too small with respect to the other graphics -- also if we are using font.pointSize. For these cases we calculate a fontRatio in ApplicationInfo that takes dpi information into account, as proposed on http://doc.qt.io/qt-5/scalability.html#calculating-scaling-ratio GCText applies this factor automatically on its new fontSize property.
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